Weil-McLain GV-4 Overheating

Intermittent overheating as high as 250 and lots of gurgling and hissing

I replaced the limit switch and set lower to 160 but still intermittently goes higher (220) with flame off











Finally got video and audio of the thing doing what it does



Not great, but you'll be able to hear (turn your sound up) and see temp



<a href="http://www.youtube.com/watch?v=l3adlVi9pP0">http://www.youtube.com/watch?v=l3adlVi9pP0</a>



Hope someone has seen this and can help





Lights top to bottom are



Flame



Pressure Switch



Limit



Circulator



Power







Temp gauge



12 o'clock is 160



1 o'clock is 190



2 o'clock is 220



3 o'clock is 250







At 1:20 flame starts and temp goes up



at 3:00 hits 160



at 3:30 starts making gurgling sounds near rear where relief valve and circulator are



at 3:45, 175-180 flame goes off - still gurgling



at 4:00 hissing sound is from the vent - pressure is 20



at 6:15 temp hits 220 even though circulator is still running



at 8:20 circ goes off , still 220



at 16:00 circ comes back on , now 225-230



at 17:00 temp starts back down



at 19:00 fan kicks on - temp is 160



Gas and flame and operates and turns off normally